Thulium Triflate Catalyzed Hydration of 2-Substituted 4-Alkynones
作者:M.-Y. Chang、Y.-C. Cheng
DOI:10.1055/s-0035-1561652
日期:——
We report on a facile synthetic route for the preparation of substituted 1,4-diketones by thulium triflate mediated hydration of substituted 4-alkynones in MeNO 2 at 25 °C for five hours. The products were obtained in moderate to high yields.
我们报告了通过三氟甲磺酸铥介导的取代 4-炔酮在 MeNO 2 中在 25°C 下水合 5 小时制备取代 1,4-二酮的简便合成路线。以中等至高产率获得产物。
TYROSINE PHOSPHATASE INHIBITORS
申请人:Takeda Chemical Industries, Ltd.
公开号:EP1284260A1
公开(公告)日:2003-02-19
A compound of the formula (I):
wherein X1 and X2 are the same or different and each is a bond or a spacer having 1 to 20 atom(s) in the main chain;
one of R1 and R2 is a cycle group having substituent(s) selected from 1) an optionally substituted carboxy-C1-6 alkoxy group and 2) an optionally substituted carboxy-C1-6 aliphatic hydrocarbon group, wherein the cycle group optionally has additional substituent(s), and the other is an optionally substituted cycle group or a hydrogen atom; and
R3, R4 and R5 are the same or different and each is a hydrogen atom or a substituent, or R4 may link together with R3 or R5 to form an optionally substituted ring;
provided that when R3 is a hydrogen atom, R4 is a hydrogen atom and R5 is methyl, X2-R2 is not 4-cyclohexylphenyl; when R3 is 4-methoxyphenyl, R4 is a hydrogen atom and R5 is methyl, X2-R2 is not 4-methoxyphenyl; and when R1 or R2 is a hydrogen atom, the adjacent X1 or X2 is not a C1-7 alkylene;
or a salt thereof exhibits a protein tyrosine phosphatase inhibitory action and is useful as a prophylactic or therapeutic agent for diabetes or the like.
An acyl-Claisen/Paal-Knorr approach to fully substituted pyrroles
作者:Nora Dittrich、Eun-Kyung Jung、Samuel J. Davidson、David Barker
DOI:10.1016/j.tet.2016.06.049
日期:2016.8
The synthesis of fully substituted pyrroles using the Paal-Knorr reaction on acyl-Claisen derived 2,3-syn-disubstituted-1,4-diketones is reported. The use of the acyl-Claisen rearrangement allows the synthesis of wide variety of syn-substituted 1,4-diketones which are shown to be better substrates for pyrrole condensation than their corresponding anti isomers. When the reaction was performed open to
A compound of the formula (I):
1
wherein X
1
and X
2
are the same or different and each is a bond or a spacer having 1 to 20 atom(s) in the main chain;
one of R
1
and R
2
is a cycle group having substituent(s) selected from 1) an optionally substituted carboxy-C
1-6
alkoxy group and 2) an optionally substituted carboxy-C
1-6
aliphatic hydrocarbon group, wherein the cycle group optionally has additional substituent(s), and the other is an optionally substituted cycle group or a hydrogen atom; and
R
3
, R
4
and R
5
are the same or different and each is a hydrogen atom or a substituent, or R
4
may link together with R
3
or R
5
to form an optionally substituted ring;
provided that when R
3
is a hydrogen atom, R
4
is a hydrogen atom and R
5
is methyl, X
2
—R
2
is not 4-cyclohexylphenyl; when R
3
is 4-methoxyphenyl, R
4
is a hydrogen atom and R
5
is methyl, X
2
—R
2
is not 4-methoxyphenyl; and when R
1
or R
2
is a hydrogen atom, the adjacent X
1
or X
2
is not a C
1-7
alkylene;
or a salt thereof exhibits a protein tyrosine phosphatase inhibitory action and is useful as a prophylactic or therapeutic agent for diabetes or the like.